| Haremere Ltd | Peterborough | 2022 |
| Haremi Employees Trustees Limited | Gloucestershire | 2020 |
| Harewood Nominees Limited | London | 1989 |
| Harex Limited | Reigate | 2008 |
| Harganhg Limited | Londonderry | 2023 |
| Harger Court Management Company Limited | Kenilworth | 2001 |
| Hargreaves Brown and Benson Limited | Colne | 2001 |
| Hargreaves Carbon Products Europe Limited | Durham | 2012 |
| Hargreaves Clearwaste Limited | Dewsbury | 2016 |
| Hargreaves Electrical Limited | Fulwood | 2022 |
| Hargreaves Homes Limited | Littlehampton | 2010 |
| Hargreaves Traffic Services Limited | Dewsbury | 2024 |
| Harim Alsultan Ltd | London | 2019 |
| Harimau Ventures Limited | London | 1998 |
| Harind Limited | Huddersfield | 2019 |
| Harison UK Ltd | London | 2016 |
| Harjak Limited | Sheffield | 1973 |
| Harker (Holdings) Ltd | Nottingham | 2020 |
| Harker Agencies Limited | Euxton Lane, Euxton | 2019 |
| Harkers Limited | Bury St Edmunds | 1993 |
| Harkers of Harrogate Limited | Harrogate | 2022 |
| Harkishan Chander Limited | Ruislip | 2024 |
| Harkstave Leisure & Care Ltd | London | 2006 |
| Harlands of Hull Ltd | London | 2021 |
| Harlaw Records Ltd | Broxburn | 2024 |
| Harlech Frozen Foods Limited | Criccieth | 2006 |
| Harlech Toyota Limited | Porthmadog | 2010 |
| Harlem New Malden Limited | Brighouse | 2022 |
| Harlequin House UK Limited | Thetford | 2016 |
| Harlequin New Homes Holdings Limited | Harrow | 2021 |
| Harlequin Open System Tools Limited | Stevenage | 2020 |
| Harlequin Software Consultants Limited | Marlborough | 2004 |
| Harlestone Homes Limited | Eastbourne | 2012 |
| Harlex Contractors Limited | Rochester | 2026 |
| Harlex Limited | Bury | 2020 |
| Harley Gardens Management Co. Limited | Poole | 2015 |
| Harley Leisure Limited | Brecon | 2001 |
| Harley Life Therapies Limited | Cardiff | 2011 |
| Harley Moon Limited | Leamington Spa | 2012 |
| Harley Partnership Limited | Clevedon | 1995 |
| Harley Robel Ltd | Sittingbourne | 2009 |
| Harley Street Hypnotherapy Consultancy Ltd | London | 2025 |
| Harley Street Medical Transport Limited | London | 2009 |
| Harley Street Mens Clinic Ltd | Swansea | 2023 |
| Harley Street Orthodontics Limited | London | 2013 |
| Harley Tuunanen Limited | Harrow | 2009 |
| Harley's (UK) Ltd | London | 2002 |
| Harleyford Estate Boat Sales and Brokerage Limited | Marlow | 2010 |
| Harleyford Estate Chandlery and Accessories Limited | Marlow | 2010 |
| Harleyford Estate Holiday Rentals Limited | Marlow | 2010 |
| Harleyford Estate Holidays Limited | Marlow | 2010 |
| Harleyford Estate Investments Ltd | Marlow | 2010 |
| Harleyford Estate Marine Maintenance & Servicing Limited | Marlow | 2010 |
| Harleyford Estate Moorings Limited | Marlow | 2010 |
| Harleyford Estate Properties Limited | Marlow | 2010 |
| Harleyford Estate Property Developments Limited | Marlow | 2010 |
| Harleyford Estate Property Sales Limited | Marlow | 2010 |
| Harleyford Estate Residential Limited | Marlow | 2010 |
| Harleyford Land Assets Limited | London | 1991 |
| Harleyford Marine Limited | London | 1984 |
| Harleyford Marine Sales Limited | London | 1996 |
| Harleys Hogroasts Limited | Usk | 2015 |
| Harleywood International Limited | Gloucester | 2008 |
| Harlow Billposting Services Ltd | Downham Market | 2019 |
| Harlow Green Limited | Coleraine | 2016 |
| Harlow Pension Trustees Limited | Loughborough | 2013 |
| Harlow Way Residents Company Limited | Witney | 1986 |
| Harlow West Limited | Harrogate | 2025 |
| Harlton Humblebee Ltd | Cambridge | 2023 |
| Harma Limited | Tring | 2003 |
| Harmashaw Limited | Farnham | 2007 |
| Harmeen Cuisines Limited | Birmingham | 2016 |
| Harmeny Services Limited | Balerno | 1998 |
| Harmer & Sons Agricultural Limited | Hawkinge, Folkestone | 2013 |
| Harmer & Sons Horticultural Limited | Hawkinge, Folkestone | 2013 |
| Harmer Electrical Limited | Dover | 2025 |
| Harmer Holdings Limited | Kettering | 1966 |
| Harmer Lifestyle Limited | Guildford | 2001 |
| Harmless Packaging Limited | Bury St. Edmunds | 2016 |
| Harmonic Drive Limited | Staffordshire Technology Park | 2006 |
| Harmonic Drive Systems Limited | Stafford | 2006 |
| Harmonie Ltd | London | 2022 |
| Harmonium Properties Ltd | Hampton | 2019 |
| Harmoniz Properties Ltd | Nuneaton | 2024 |
| Harmont Investment Company Limited | Manchester | 1963 |
| Harmony Wedding Rings Limited | Southport | 2014 |
| Harmony Wellness Ltd | Slough | 2025 |
| Harmonybeing Ltd | Haverfordwest | 2021 |
| Harmonyharbor Wellbeing Ltd | Edinburgh | 2026 |
| Harmonyhaven Properties Ltd | London | 2024 |
| Harmonyhaven Solutions Ltd | London | 2026 |
| Harmonyheal Dynamics Ltd | London | 2026 |
| Harmonyheal Partners Ltd | London | 2025 |
| Harmonyheart Wellbeing Ltd | London | 2025 |
| Harmonyhues Wellness Ltd | London | 2026 |
| Harmonypeak Investments Ltd | Manchester | 2025 |
| Harmood Grove Limited | London | 2006 |
| Harnaik Johal Ltd | Wolverhampton | 2025 |
| Harnes Service Limited | London | 2021 |
| Harness Homes Ltd | London | 2025 |